[Webkit-unassigned] [Bug 264371] New: [WGSL] textureSampleGrad is not implemented

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264371

            Bug ID: 264371
           Summary: [WGSL] textureSampleGrad is not implemented
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGPU
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mwyrzykowski at apple.com

textureSampleGrad should map to sample which takes a gradient (page 202 of the Metal shading language spec)

Open https://webgpu.github.io/webgpu-samples/samples/normalMap.

Note the failure:

MSL compilation error: Error Domain=MTLLibraryErrorDomain Code=3 "program_source:120:26: error: use of undeclared identifier 'textureSampleGrad'
        if ((local7.z >= textureSampleGrad(global11, global8, local7.xy, local2, local3).r)) {
                         ^
" UserInfo={NSLocalizedDescription=program_source:120:26: error: use of undeclared identifier 'textureSampleGrad'
        if ((local7.z >= textureSampleGrad(global11, global8, local7.xy, local2, local3).r)) {


it comes from this WGSL:

 // Walk the depth texture, and stop when the ray intersects the depth map
  var pos = vec3(startUV, 0);
  for (var i = 0; i < 32; i++) {
    if (pos.z >= textureSampleGrad(depthTexture, textureSampler, pos.xy, ddx, ddy).r) {
      break; // Hit the surface
    }
    pos += posDelta;
  }

in https://webgpu.github.io/webgpu-samples/samples/normalMap#./normalMap.wgsl

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